Wonderful Tomato Mac and Cheese
PAM5-6 plum tomatoes, sliced (need about 16-18 slices)2 T. flour2 T. butter, softened4 c. chicken stock or broth3 c. milk, divided1 t. salt1 t. Dijon mustard18 ozs. whole grain pasta shells, or your favorite4 ½ ozs. frozen artichoke hearts, thawed…